• Title/Summary/Keyword: 탄소연속섬유

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Enhancement of the Mechanical Properties of CNT Fibers Synthesized by Direct Spinning Method with Various Post-Treatments (직접 방사법으로 합성된 탄소나노튜브 섬유의 기계적 특성 향상)

  • Kim, Jin-seok;Park, Junbeom;Kim, Seung Min;Kwac, L.K;Hwang, Jun Yeon
    • Composites Research
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    • v.28 no.4
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    • pp.239-243
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    • 2015
  • Recent studies regarding the properties of carbon nanotubes (CNT) have made remarkable progress in CNT fibers research. However no CNT fibers showed the properties of CNTs because CNTs in fibers have weak interfacial bonding with low shear modulus in the pristine form. Thus, it is upmost interest to develop and employ post-production treatments to the CNT fibers that would potentially improve their properties. In this study, post-treatments resulted in improvement of strength of CNT fibers up to 40%.

Study of Stabilization Process of PAN Precursor and its Characteristics Change by Plasma Treatment (플라즈마 처리 방법을 이용한 PAN 전구체 특성 변화 연구)

  • Kang, Hyo-Kyoung;Kim, Jung-Yeon;Kim, Hak-Yong;Choi, Yeong-Og
    • Composites Research
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    • v.34 no.1
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    • pp.23-29
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    • 2021
  • Commercialized carbon fiber obtained from polyacrylonitrile(PAN) precursor is subjected to oxidation stabilization at 180 to 300℃ in air atmosphere and carbonization process at 1600℃ or lower in inert gas atmosphere. Both of these processes use a lot of time and high energy, but are essential and important for producing high-performance carbon fibers. Therefore, in recent years, an alternative stabilization technology by being assisted with various other energy sources such as plasma, electron beam and microwave which can shorten the process time and lower energy consumption has been studied. In this study, the PAN precursor was stabilized by using plasma treatment and heat treatment continuously. The morphology, structural changes, thermal and physical properties were analyzed using Field emission scanning electron microscopy(FE-SEM), X-ray diffraction(XRD), Fourier transform infrared(FT-IR), Thermogravimetric analysis(TGA) and Favimat.

Characterization of Composite Frame for Enhancing Energy Harvesting Function of a Smart Shoes (스마트 슈즈의 에너지 하베스팅 기능향상을 위한 복합재료 프레임 특성평가)

  • Lee, Ho-Seok;Jung, In-Jun;Chang, Seung-Hwan
    • Composites Research
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    • v.34 no.6
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    • pp.400-405
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    • 2021
  • In this study, a composite material frame was designed to increase the energy harvesting efficiency of polyvinylidene fluoride (PVDF) ribbon harvesters which are installed inside smart shoes. In order to minimize the amount of deformation in the load direction of the frame, it was designed using carbon continuous fiber composites and its complex shaped structure was manufactured using a 3D printer. In order to calculate the amount of deformation of the insole and midsole of the shoes under the condition of the load generated during walking, the insole and midsole were modeled using the distributed spring elements. Using finite element analysis, the elongation of ribbon-type harvesters mounted on smart shoes was calculated during walking. It is expected that the predicted elongation of the harvester can be utilized to increase the energy harvesting efficiency of smart shoes.

Mechanical and Thermal Properties of Phenolic Composite reinforced with Hybrid of Carbon Fabrics (하이브리드화에 의한 탄소 직물 복합재료의 역학적 특성 및 열적 특성)

  • Kim, Jae-Hong;Park, Jong-Kyu;Jung, Kyung-Ho;Kang, Tae-Jin
    • Composites Research
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    • v.20 no.4
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    • pp.18-24
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    • 2007
  • The mechanical and thermal properties of PAN-based/rayon-based carbon fabrics interply hybrid composite materials have been studied. Mechanical properties including tensile and interlaminar shear strengths were improved with increasing amount of continuous PAN-based carbon fabrics. The erosion rate and insulation index were determined through the torch test. Continuous rayon-based carbon fabrics composite indicated relatively low ablation resistant property. The thermal conductivity of hybrid composite of spun PAN-based/continuous rayon-based carbon fabrics is lower than that of the continuous PAN-based carbon fabrics composite.

A study on the properties of the carbon long-fiber-reinforced thermoplastic composite material using LFT-D method (LFT-D공법을 이용한 탄소 장섬유 강화 열가소성 복합재의 특성에 관한 연구)

  • Park, Myung-Kyu;Park, Si-Woo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.5
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    • pp.80-85
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    • 2016
  • Carbon fiber-reinforced composite materials have been widely used in various industrial fields, but there are limits to increasing their strength and stiffness, because of the short-length fibers that are impregnated in them. In this study, a lab-scale small extruder system was developed with the capability to perform the carbon fiber impregnation and extrusion process in order to evaluate the properties of long-length carbon fiber reinforced thermoplastic composite materials molded by the LFT-D method. Specimens were made with the small extruder to press-mold long-length carbon fiber composite materials and evaluate their material properties. As a result, it was found that the carbon fiber length, press load and carbon fiber contents have a considerable influence on the strength and stiffness. Additional studies on such factors as the mixing screw design and coating of the carbon fiber are needed in order to improve the mechanical properties of carbon fiber composite materials.

Characteristics of Large-area PTFE Filter Coated with PTFE Nanofiber Fabricated by Roll-to-roll Equipment (Roll-to-roll 공정으로 제조한 나노섬유가 코팅된 대면적 PTFE 필터 특성)

  • Ahn, Seunghwan;Lee, Woo Jin;Kim, Yeonsang;Shim, Euijin;Eom, Hyeonjin
    • Applied Chemistry for Engineering
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    • v.33 no.6
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    • pp.613-617
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    • 2022
  • The equipment for fabricating the large-area PTFE nanofiber coated-PTFE foam filter for use as filtration parts of the baghouse that removes particulate matter (PM) in industrial sites was designed and manufactured in this study. The PTFE nanofiber was coated on a commercial PTFE foam filter to increase its PM collection efficiency. The equipment and fabrication processes using a roll-to-roll system were proposed to continuously coat PTFE nanofibers on the surface of the PTFE foam filter. The electrospinning and annealing parts were designed and made by optimizing the equipment for the roll-to-roll system. The surface morphology, composition, and filtration characteristics of the large-area filter fabricated by this equipment were confirmed. PTFE nanofibers were uniformly coated on the large-area filter, and the PTFE nanofiber coated-PTFE foam filter showed PM2.5 collection efficiency of 91.79% and an appropriate pressure drop of 62 Pa with a face velocity of 1 m/min at 280 ℃.

Effect of Carboxylic Acid Group of Functionalized Carbon Nanotubes on Properties of Electrospun Polyacrylonitrile (PAN) Fibers (기능화된 탄소나노튜브의 카르복실산이 전기방사된 폴리아크릴로니트릴 섬유의 물성에 미치는 영향)

  • Park, Ok-Kyung;Kim, Ju-Hyung;Lee, Sung-Ho;Lee, Joong-Hee;Chung, Yong-Sik;Kim, Jun-Kyung;Ku, Bon-Cheol
    • Polymer(Korea)
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    • v.35 no.5
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    • pp.472-477
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    • 2011
  • To study the effects of the acid group of functionalized MWNT (multiwalled carbon nanotube) on the thermal and mechanical properties of polyacrylonitrile(PAN) nanofibers, acid ($H_2SO_4/HNO_3$) treated MWNT (O-MWNT) were further functionalized by diazonium salt reaction with 5-aminoisophthalic acid (IPA). Compared to O-MWNT, IPA-MWNT with isophthalic acid group showed a better dispersion stability in polar solvents and IPA-MWNT/PAN composite film displayed lower heat of reaction (${\Delta}H$) than that of homo PAN when stabilized under air atmosphere. The continuous electrospun fibers were prepared using a conductive water bath. PAN fibers containing 1 wt% of IPA-MWNT showed an increase of tensile strength by 100% and tensile modulus by 240% compared to the PAN fibers without IPA-MWNT.

Fabrication and resistance heating properties of flexible SiC fiber rope as heating elements (유연한 탄화규소 섬유 로프 발열체의 제조와 저항 발열 특성)

  • Joo, Young Jun;Cho, Kwang Youn
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.30 no.6
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    • pp.258-263
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    • 2020
  • Silicon carbide (SiC) fibers mainly fabricated from polycarbosilane, a ceramic precursor, are applied as reinforcing materials for ceramic matrix composites (CMCs) because of their high temperature oxidation resistance, tensile strength, and light weight. In this study, continuous SiC fibers used to fabricate rope-type flexible heating elements capable of generating high-temperature heat (> 650℃). For high-efficiency heating elements, the resistance of SiC fiber rope was measured by 2-point probe method according to the cross-sectional area and length. In addition, the fabrication conditions of rope-type SiC fiber heating elements were optimized by controlling the oxygen impurities and the size of crystal grains present in the amorphous SiC fiber. As a result, the SiC fiber heating element having a resistance range of about 100~200 Ω exhibited an excellent power consumption efficiency of 1.5 times compared to that of the carbon fiber heating element.

Electricity Generation and Microbial Community variation in Microbial Fuel Cell with various Electrode Combinations. (다양한 탄소전극조합에 따른 미생물 연료전지의 전기발생량 및 미생물 군집변화)

  • Kwon, Jae-Hyeong;Choi, Soo-Jung;Cha, Jae-Hwan;Kim, Hyo-Soo;Kim, Ye-Jin;Yu, Jae-Cheul;Kim, Chan-Won
    • Journal of Korean Society of Environmental Engineers
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    • v.32 no.1
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    • pp.87-96
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    • 2010
  • The electrode material is one of the factors affecting the power production of microbial fuel cell. In this study, effects of carbon electrode material, thickness and configuration on the power density, biofilm formation and microbial community diversity of microbial fuel cell were investigated. To optimize the anode-cathode electrode assembly, seven lab-scale reactors which had various carbon electrode constructions were operated in continuous mode. Under the steady state condition, the electrode combination of graphite felt (6 mm) with hole showed the highest cell voltage of 238 mV and the coulombic efficiency of 37%. As a result of SEM analysis, the bacteria growing on surface of knitted type of carbon cloth and graphite felt electrode ncreased significantly. The change of dominant species between seeding sludge and biofilm on the surface of anode electrode, microbial analysis with PCR-DGGE showed that the dominant species of seeding sludge are quite different from those of biofilm on the surface of each anode electrode. Especially Geobacter sp., a well known electrochemical bacteria, was found as the dominant species of the electrode combination with graphite felt.